Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-12-01
1985-12-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
226 45, G01V 904, B65H 2502
Patent
active
045582165
ABSTRACT:
Checking device for protecting against faults arising from a paper wind-up in a rotary printing machine having a printing unit with a blanket cylinder and a printing-unit protecting grid, the checking device including at least one control device disposed in stationary relationship with respect to and adjacent the blanket cylinder and upstream in travel direction of paper through the printing machine, of a location at which the paper wind-up is produced and including a photoelectric sensor formed as a contrast measurement detector for scanning the blanket of the blanket cylinder and generating a signal when a print product is present, the sensor being mounted on the protecting grid at a lower region thereof and being foldable away together with the protecting grid.
REFERENCES:
patent: 3264630 (1966-08-01), Conklin et al.
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patent: 3515883 (1970-06-01), Akamatsu et al.
patent: 3684890 (1972-08-01), Hayne et al.
patent: 4310153 (1982-01-01), Kikuchi
patent: 4365151 (1982-12-01), Fasig et al.
patent: 4417148 (1983-11-01), Otake
Blasius Udo
Rodi Anton
Uhrig Dieter
Brophy J. Jon
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Jorgensen Adam A.
Lerner Herbert L.
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